VelocityServlet.java
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org.apache.velocity.servlet |
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Apache Velocity Engine |
View: Reasons, Metrics, Source Code
These are the metrics that contribute to the Enerjy Score for this file, ranked by impact. So the metrics listed at the top influence the score to a greater extent that the metrics listed at the bottom.
| Metric | Description | |
|---|---|---|
| COMMENTS | Comment lines |  |
| DOC_COMMENT | Number of javadoc comment lines | |
| EXEC_COMMENTS | Comments in executable code | |
| JAVA0173 | JAVA0173 Unused method parameter | |
| JAVA0126 | JAVA0126 Method declares unchecked exception in throws | |
| SIZE | Size of the file in bytes | |
| DECL_COMMENTS | Comments in declarations | |
| JAVA0034 | JAVA0034 Missing braces in if statement | |
| LINES | Number of lines in the source file | |
| JAVA0160 | JAVA0160 Method does not throw specified exception | |
| BLOCK_COMMENT | Number of block comment lines | |
| JAVA0117 | JAVA0117 Missing javadoc: method 'method' | |
| JAVA0166 | JAVA0166 Generic exception caught | |
| INTERFACE_COMPLEXITY | Interface complexity | |
| PROGRAM_VOLUME | Halstead program volume | |
| PARAMS | Number of formal parameter declarations | |
| JAVA0110 | JAVA0110 Incorrect javadoc: no @return tag | |
| JAVA0064 | JAVA0064 N variations of identifier name (maximum: M) | |
| RETURNS | Number of return points from functions | |
| EXITS | Procedure exits | |
| LOOPS | Number of loops | |
| JAVA0108 | JAVA0108 Incorrect javadoc: no @param tag for 'parameter' | |
| UNIQUE_OPERATORS | Number of unique operators | |
| NEST_DEPTH | Maximum nesting depth | |
| PROGRAM_VOCAB | Halstead program vocabulary | |
| JAVA0145 | JAVA0145 Tab character used in source file | |
package org.apache.velocity.servlet;
/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.OutputStreamWriter;
import java.io.PrintWriter;
import java.io.StringWriter;
import java.io.UnsupportedEncodingException;
import java.util.Properties;
import javax.servlet.ServletConfig;
import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.velocity.Template;
import org.apache.velocity.VelocityContext;
import org.apache.velocity.app.Velocity;
import org.apache.velocity.context.Context;
import org.apache.velocity.exception.MethodInvocationException;
import org.apache.velocity.exception.ParseErrorException;
import org.apache.velocity.exception.ResourceNotFoundException;
import org.apache.velocity.io.VelocityWriter;
import org.apache.velocity.runtime.RuntimeConstants;
import org.apache.velocity.runtime.RuntimeSingleton;
import org.apache.velocity.util.SimplePool;
/**
* Base class which simplifies the use of Velocity with Servlets.
* Extend this class, implement the <code>handleRequest()</code> method,
* and add your data to the context. Then call
* <code>getTemplate("myTemplate.wm")</code>.
*
* This class puts some things into the context object that you should
* be aware of:
* <pre>
* "req" - The HttpServletRequest object
* "res" - The HttpServletResponse object
* </pre>
*
* There are other methods you can override to access, alter or control
* any part of the request processing chain. Please see the javadocs for
* more information on :
* <ul>
* <li> loadConfiguration() : for setting up the Velocity runtime
* <li> createContext() : for creating and loading the Context
* <li> setContentType() : for changing the content type on a request
* by request basis
* <li> handleRequest() : you <b>must</b> implement this
* <li> mergeTemplate() : the template rendering process
* <li> requestCleanup() : post rendering resource or other cleanup
* <li> error() : error handling
* </ul>
* <br>
* If you put a String with key "contentType" object into the context within either your
* servlet or within your template, then that will be used to override
* the default content type specified in the properties file.
*
* @deprecated This servlet has been replaced by VelocityViewServlet,
* available from the Velocity-Tools sub-project. VelocityViewServlet
* provides support for quick, clean MVC web development.
* VelocityServlet will be removed in a future version of Velocity.
*
* @author Dave Bryson
* @author <a href="mailto:jon@latchkey.com">Jon S. Stevens</a>
* @author <a href="mailto:geirm@optonline.net">Geir Magnusson Jr.</a>
* @author <a href="kjohnson@transparent.com">Kent Johnson</a>
* @author <a href="dlr@finemaltcoding.com">Daniel Rall</a>
* $Id: VelocityServlet.java 463298 2006-10-12 16:10:32Z henning $
*/
public abstract class VelocityServlet extends HttpServlet
{
/**
* The context key for the HTTP request object.
*/
public static final String REQUEST = "req";
/**
* The context key for the HTTP response object.
*/
public static final String RESPONSE = "res";
/**
* The HTTP content type context key.
*/
public static final String CONTENT_TYPE = "default.contentType";
/**
* The default content type for the response
*/
public static final String DEFAULT_CONTENT_TYPE = "text/html";
/**
* Encoding for the output stream
*/
public static final String DEFAULT_OUTPUT_ENCODING = "ISO-8859-1";
/**
* The default content type, itself defaulting to {@link
* #DEFAULT_CONTENT_TYPE} if not configured.
*/
private static String defaultContentType;
/**
* This is the string that is looked for when getInitParameter is
* called (<code>org.apache.velocity.properties</code>).
*/
protected static final String INIT_PROPS_KEY =
"org.apache.velocity.properties";
/**
* Use of this properties key has been deprecated, and will be
* removed in Velocity version 1.5.
*/
private static final String OLD_INIT_PROPS_KEY = "properties";
/**
* Cache of writers
*/
private static SimplePool writerPool = new SimplePool(40);
/**
* Performs initialization of this servlet. Called by the servlet
* container on loading.
*
* @param config The servlet configuration to apply.
*
* @exception ServletException
*/
public void init( ServletConfig config )
throws ServletException
{
super.init( config );
/*
* do whatever we have to do to init Velocity
*/
initVelocity( config );
/*
* Now that Velocity is initialized, cache some config.
*/
VelocityServlet.defaultContentType =
RuntimeSingleton.getString(CONTENT_TYPE, DEFAULT_CONTENT_TYPE);
}
/**
* Initializes the Velocity runtime, first calling
* loadConfiguration(ServletConvig) to get a
* java.util.Properties of configuration information
* and then calling Velocity.init(). Override this
* to do anything to the environment before the
* initialization of the singelton takes place, or to
* initialize the singleton in other ways.
* @param config
* @throws ServletException
*/
protected void initVelocity( ServletConfig config )
throws ServletException
{
try
{
/*
* call the overridable method to allow the
* derived classes a shot at altering the configuration
* before initializing Runtime
*/
Properties props = loadConfiguration( config );
Velocity.init( props );
}
catch( Exception e )
{
throw new ServletException("Error initializing Velocity: " + e, e);
}
}
/**
* Loads the configuration information and returns that
* information as a Properties, which will be used to
* initialize the Velocity runtime.
* <br><br>
* Currently, this method gets the initialization parameter
* VelocityServlet.INIT_PROPS_KEY, which should be a file containing
* the configuration information.
* <br><br>
* To configure your Servlet Spec 2.2 compliant servlet runner to pass
* this to you, put the following in your WEB-INF/web.xml file
* <br>
* <pre>
* <servlet>
* <servlet-name> YourServlet </servlet-name>
* <servlet-class> your.package.YourServlet </servlet-class>
* <init-param>
* <param-name> org.apache.velocity.properties </param-name>
* <param-value> velocity.properties </param-value>
* </init-param>
* </servlet>
* </pre>
*
* Alternately, if you wish to configure an entire context in this
* fashion, you may use the following:
* <br>
* <pre>
* <context-param>
* <param-name> org.apache.velocity.properties </param-name>
* <param-value> velocity.properties </param-value>
* <description> Path to Velocity configuration </description>
* </context-param>
* </pre>
*
* Derived classes may do the same, or take advantage of this code to do the loading for them via :
* <pre>
* Properties p = super.loadConfiguration( config );
* </pre>
* and then add or modify the configuration values from the file.
* <br>
*
* @param config ServletConfig passed to the servlets init() function
* Can be used to access the real path via ServletContext (hint)
* @return java.util.Properties loaded with configuration values to be used
* to initialize the Velocity runtime.
* @throws FileNotFoundException if a specified file is not found.
* @throws IOException I/O problem accessing the specified file, if specified.
* @deprecated Use VelocityViewServlet from the Velocity Tools
* library instead.
*/
protected Properties loadConfiguration(ServletConfig config)
throws IOException, FileNotFoundException
{
// This is a little overly complex because of legacy support
// for the initialization properties key "properties".
// References to OLD_INIT_PROPS_KEY should be removed at
// Velocity version 1.5.
String propsFile = config.getInitParameter(INIT_PROPS_KEY);
if (propsFile == null || propsFile.length() == 0)
{
ServletContext sc = config.getServletContext();
propsFile = config.getInitParameter(OLD_INIT_PROPS_KEY);
if (propsFile == null || propsFile.length() == 0)
{
propsFile = sc.getInitParameter(INIT_PROPS_KEY);
if (propsFile == null || propsFile.length() == 0)
{
propsFile = sc.getInitParameter(OLD_INIT_PROPS_KEY);
if (propsFile != null && propsFile.length() > 0)
{
sc.log("Use of the properties initialization " +
"parameter '" + OLD_INIT_PROPS_KEY + "' has " +
"been deprecated by '" + INIT_PROPS_KEY + '\'');
}
}
}
else
{
sc.log("Use of the properties initialization parameter '" +
OLD_INIT_PROPS_KEY + "' has been deprecated by '" +
INIT_PROPS_KEY + '\'');
}
}
/*
* This will attempt to find the location of the properties
* file from the relative path to the WAR archive (ie:
* docroot). Since JServ returns null for getRealPath()
* because it was never implemented correctly, then we know we
* will not have an issue with using it this way. I don't know
* if this will break other servlet engines, but it probably
* shouldn't since WAR files are the future anyways.
*/
Properties p = new Properties();
if ( propsFile != null )
{
p.load(getServletContext().getResourceAsStream(propsFile));
}
return p;
}
/**
* Handles HTTP <code>GET</code> requests by calling {@link
* #doRequest(HttpServletRequest, HttpServletResponse)}.
* @param request
* @param response
* @throws ServletException
* @throws IOException
*/
public void doGet( HttpServletRequest request, HttpServletResponse response )
throws ServletException, IOException
{
doRequest(request, response);
}
/**
* Handles HTTP <code>POST</code> requests by calling {@link
* #doRequest(HttpServletRequest, HttpServletResponse)}.
* @param request
* @param response
* @throws ServletException
* @throws IOException
*/
public void doPost( HttpServletRequest request, HttpServletResponse response )
throws ServletException, IOException
{
doRequest(request, response);
}
/**
* Handles all requests (by default).
*
* @param request HttpServletRequest object containing client request
* @param response HttpServletResponse object for the response
* @throws ServletException
* @throws IOException
*/
protected void doRequest(HttpServletRequest request, HttpServletResponse response )
throws ServletException, IOException
{
Context context = null;
try
{
/*
* first, get a context
*/
context = createContext( request, response );
/*
* set the content type
*/
setContentType( request, response );
/*
* let someone handle the request
*/
Template template = handleRequest( request, response, context );
/*
* bail if we can't find the template
*/
if ( template == null )
{
return;
}
/*
* now merge it
*/
mergeTemplate( template, context, response );
}
catch (Exception e)
{
/*
* call the error handler to let the derived class
* do something useful with this failure.
*/
error( request, response, e);
}
finally
{
/*
* call cleanup routine to let a derived class do some cleanup
*/
requestCleanup( request, response, context );
}
}
/**
* A cleanup routine which is called at the end of the {@link
* #doRequest(HttpServletRequest, HttpServletResponse)}
* processing sequence, allowing a derived class to do resource
* cleanup or other end of process cycle tasks.
*
* @param request servlet request from client
* @param response servlet reponse
* @param context context created by the createContext() method
*/
protected void requestCleanup( HttpServletRequest request, HttpServletResponse response, Context context )
{
}
/**
* merges the template with the context. Only override this if you really, really
* really need to. (And don't call us with questions if it breaks :)
*
* @param template template object returned by the handleRequest() method
* @param context context created by the createContext() method
* @param response servlet reponse (use this to get the output stream or Writer
* @throws ResourceNotFoundException
* @throws ParseErrorException
* @throws MethodInvocationException
* @throws IOException
* @throws UnsupportedEncodingException
* @throws Exception
*/
protected void mergeTemplate( Template template, Context context, HttpServletResponse response )
throws ResourceNotFoundException, ParseErrorException,
MethodInvocationException, IOException, UnsupportedEncodingException, Exception
{
ServletOutputStream output = response.getOutputStream();
VelocityWriter vw = null;
// ASSUMPTION: response.setContentType() has been called.
String encoding = response.getCharacterEncoding();
try
{
vw = (VelocityWriter) writerPool.get();
if (vw == null)
{
vw = new VelocityWriter(new OutputStreamWriter(output,
encoding),
4 * 1024, true);
}
else
{
vw.recycle(new OutputStreamWriter(output, encoding));
}
template.merge(context, vw);
}
finally
{
if (vw != null)
{
try
{
/*
* flush and put back into the pool
* don't close to allow us to play
* nicely with others.
*/
vw.flush();
}
catch (IOException e)
{
// do nothing
}
/*
* Clear the VelocityWriter's reference to its
* internal OutputStreamWriter to allow the latter
* to be GC'd while vw is pooled.
*/
vw.recycle(null);
writerPool.put(vw);
}
}
}
/**
* Sets the content type of the response, defaulting to {@link
* #defaultContentType} if not overriden. Delegates to {@link
* #chooseCharacterEncoding(HttpServletRequest)} to select the
* appropriate character encoding.
*
* @param request The servlet request from the client.
* @param response The servlet reponse to the client.
*/
protected void setContentType(HttpServletRequest request,
HttpServletResponse response)
{
String contentType = VelocityServlet.defaultContentType;
int index = contentType.lastIndexOf(';') + 1;
if (index <= 0 || (index < contentType.length() &&
contentType.indexOf("charset", index) == -1))
{
// Append the character encoding which we'd like to use.
String encoding = chooseCharacterEncoding(request);
//RuntimeSingleton.debug("Chose output encoding of '" +
// encoding + '\'');
if (!DEFAULT_OUTPUT_ENCODING.equalsIgnoreCase(encoding))
{
contentType += "; charset=" + encoding;
}
}
response.setContentType(contentType);
//RuntimeSingleton.debug("Response Content-Type set to '" +
// contentType + '\'');
}
/**
* Chooses the output character encoding to be used as the value
* for the "charset=" portion of the HTTP Content-Type header (and
* thus returned by <code>response.getCharacterEncoding()</code>).
* Called by {@link #setContentType(HttpServletRequest,
* HttpServletResponse)} if an encoding isn't already specified by
* Content-Type. By default, chooses the value of
* RuntimeSingleton's <code>output.encoding</code> property.
*
* @param request The servlet request from the client.
* @return The chosen character encoding.
*/
protected String chooseCharacterEncoding(HttpServletRequest request)
{
return RuntimeSingleton.getString(RuntimeConstants.OUTPUT_ENCODING,
DEFAULT_OUTPUT_ENCODING);
}
/**
* Returns a context suitable to pass to the handleRequest() method
* <br><br>
* Default implementation will create a VelocityContext object,
* put the HttpServletRequest and HttpServletResponse
* into the context accessable via the keys VelocityServlet.REQUEST and
* VelocityServlet.RESPONSE, respectively.
*
* @param request servlet request from client
* @param response servlet reponse to client
*
* @return context
*/
protected Context createContext(HttpServletRequest request, HttpServletResponse response )
{
/*
* create a new context
*/
VelocityContext context = new VelocityContext();
/*
* put the request/response objects into the context
* wrap the HttpServletRequest to solve the introspection
* problems
*/
context.put( REQUEST, request );
context.put( RESPONSE, response );
return context;
}
/**
* Retrieves the requested template.
*
* @param name The file name of the template to retrieve relative to the
* template root.
* @return The requested template.
* @throws ResourceNotFoundException if template not found
* from any available source.
* @throws ParseErrorException if template cannot be parsed due
* to syntax (or other) error.
* @throws Exception if an error occurs in template initialization
*/
public Template getTemplate( String name )
throws ResourceNotFoundException, ParseErrorException, Exception
{
return RuntimeSingleton.getTemplate(name);
}
/**
* Retrieves the requested template with the specified
* character encoding.
*
* @param name The file name of the template to retrieve relative to the
* template root.
* @param encoding the character encoding of the template
*
* @return The requested template.
* @throws ResourceNotFoundException if template not found
* from any available source.
* @throws ParseErrorException if template cannot be parsed due
* to syntax (or other) error.
* @throws Exception if an error occurs in template initialization
*
* @since Velocity v1.1
*/
public Template getTemplate( String name, String encoding )
throws ResourceNotFoundException, ParseErrorException, Exception
{
return RuntimeSingleton.getTemplate( name, encoding );
}
/**
* Implement this method to add your application data to the context,
* calling the <code>getTemplate()</code> method to produce your return
* value.
* <br><br>
* In the event of a problem, you may handle the request directly
* and return <code>null</code> or throw a more meaningful exception
* for the error handler to catch.
*
* @param request servlet request from client
* @param response servlet reponse
* @param ctx The context to add your data to.
* @return The template to merge with your context or null, indicating
* that you handled the processing.
* @throws Exception
*
* @since Velocity v1.1
*/
protected Template handleRequest( HttpServletRequest request, HttpServletResponse response, Context ctx )
throws Exception
{
/*
* invoke handleRequest
*/
Template t = handleRequest( ctx );
/*
* if it returns null, this is the 'old' deprecated
* way, and we want to mimic the behavior for a little
* while anyway
*/
if (t == null)
{
throw new Exception ("handleRequest(Context) returned null - no template selected!" );
}
return t;
}
/**
* Implement this method to add your application data to the context,
* calling the <code>getTemplate()</code> method to produce your return
* value.
* <br><br>
* In the event of a problem, you may simple return <code>null</code>
* or throw a more meaningful exception.
*
* @deprecated Use
* {@link #handleRequest( HttpServletRequest request,
* HttpServletResponse response, Context ctx )}
*
* @param ctx The context to add your data to.
* @return The template to merge with your context.
* @throws Exception
*/
protected Template handleRequest( Context ctx )
throws Exception
{
throw new Exception ("You must override VelocityServlet.handleRequest( Context) "
+ " or VelocityServlet.handleRequest( HttpServletRequest, "
+ " HttpServletResponse, Context)" );
}
/**
* Invoked when there is an error thrown in any part of doRequest() processing.
* <br><br>
* Default will send a simple HTML response indicating there was a problem.
*
* @param request original HttpServletRequest from servlet container.
* @param response HttpServletResponse object from servlet container.
* @param cause Exception that was thrown by some other part of process.
* @throws ServletException
* @throws IOException
*/
protected void error( HttpServletRequest request, HttpServletResponse response, Exception cause )
throws ServletException, IOException
{
StringBuffer html = new StringBuffer();
html.append("<html>");
html.append("<title>Error</title>");
html.append("<body bgcolor=\"#ffffff\">");
html.append("<h2>VelocityServlet: Error processing the template</h2>");
html.append("<pre>");
String why = cause.getMessage();
if (why != null && why.trim().length() > 0)
{
html.append(why);
html.append("<br>");
}
StringWriter sw = new StringWriter();
cause.printStackTrace( new PrintWriter( sw ) );
html.append( sw.toString() );
html.append("</pre>");
html.append("</body>");
html.append("</html>");
response.getOutputStream().print( html.toString() );
}
}
The table below shows all metrics for VelocityServlet.java.
| Metric | Value | Description | |
|---|---|---|---|
| BLOCKS | 39.00 | Number of blocks | |
| BLOCK_COMMENT | 86.00 | Number of block comment lines | |
| COMMENTS | 395.00 | Comment lines | |
| COMMENT_DENSITY | 2.34 | Comment density | |
| COMPARISONS | 20.00 | Number of comparison operators | |
| CYCLOMATIC | 38.00 | Cyclomatic complexity | |
| DECL_COMMENTS | 27.00 | Comments in declarations | |
| DOC_COMMENT | 298.00 | Number of javadoc comment lines | |
| ELOC | 169.00 | Effective lines of code | |
| EXEC_COMMENTS | 23.00 | Comments in executable code | |
| EXITS | 42.00 | Procedure exits | |
| FUNCTIONS | 16.00 | Number of function declarations | |
| HALSTEAD_DIFFICULTY | 62.24 | Halstead difficulty | |
| HALSTEAD_EFFORT | 0.00 | Halstead effort | |
| INTERFACE_COMPLEXITY | 68.00 | Interface complexity | |
| JAVA0001 | 0.00 | JAVA0001 Package name does not contain only lower case letters | |
| JAVA0002 | 0.00 | JAVA0002 Package name does not begin with a top level domain name or country code | |
| JAVA0003 | 0.00 | JAVA0003 Minimize use of on-demand (.*) imports | |
| JAVA0004 | 0.00 | JAVA0004 Unnecessary import from java.lang | |
| JAVA0005 | 0.00 | JAVA0005 Imports not in specified order | |
| JAVA0006 | 0.00 | JAVA0006 Empty finally block | |
| JAVA0007 | 0.00 | JAVA0007 Should not declare public field | |
| JAVA0008 | 0.00 | JAVA0008 Empty catch block | |
| JAVA0009 | 0.00 | JAVA0009 Protected member in final class | |
| JAVA0010 | 0.00 | JAVA0010 Non-instantiable class does not contain a non-private static member | |
| JAVA0011 | 1.00 | JAVA0011 Abstract class does not contain an abstract method | |
| JAVA0012 | 0.00 | JAVA0012 Non-constructor method with same name as declaring class | |
| JAVA0013 | 0.00 | JAVA0013 Non-blank final field is not static | |
| JAVA0014 | 0.00 | JAVA0014 Class with only static members has non-private constructor | |
| JAVA0015 | 0.00 | JAVA0015 Package class contains public nested type | |
| JAVA0016 | 0.00 | JAVA0016 Abstract class contains public constructor | |
| JAVA0017 | 0.00 | JAVA0017 Class name does not have required form | |
| JAVA0018 | 0.00 | JAVA0018 Method name does not have required form | |
| JAVA0019 | 0.00 | JAVA0019 Interface name does not have required form | |
| JAVA0020 | 0.00 | JAVA0020 Field name does not have required form | |
| JAVA0021 | 0.00 | JAVA0021 Interface method name does not have required form | |
| JAVA0022 | 0.00 | JAVA0022 Static final field name does not have required form | |
| JAVA0023 | 0.00 | JAVA0023 Empty finalize method | |
| JAVA0024 | 0.00 | JAVA0024 Empty class | |
| JAVA0025 | 0.00 | JAVA0025 Method override is empty | |
| JAVA0026 | 0.00 | JAVA0026 Finalize method with parameters | |
| JAVA0029 | 0.00 | JAVA0029 Private method not used | |
| JAVA0030 | 0.00 | JAVA0030 Private field not used | |
| JAVA0031 | 0.00 | JAVA0031 Case statement not properly closed | |
| JAVA0032 | 0.00 | JAVA0032 Switch statement missing default | |
| JAVA0033 | 0.00 | JAVA0033 default: not last case in switch statement | |
| JAVA0034 | 0.00 | JAVA0034 Missing braces in if statement | |
| JAVA0035 | 0.00 | JAVA0035 Missing braces in for statement | |
| JAVA0036 | 0.00 | JAVA0036 Missing braces in while statement | |
| JAVA0038 | 0.00 | JAVA0038 Non-case label in switch statement | |
| JAVA0039 | 0.00 | JAVA0039 Break statement with label | |
| JAVA0040 | 0.00 | JAVA0040 Switch statement contains N cases (maximum: M) | |
| JAVA0041 | 0.00 | JAVA0041 Nested synchronized block | |
| JAVA0042 | 0.00 | JAVA0042 Empty synchronized statement | |
| JAVA0043 | 0.00 | JAVA0043 Inner class does not use outer class | |
| JAVA0044 | 0.00 | JAVA0044 Serializable class with no instance variables | |
| JAVA0045 | 0.00 | JAVA0045 Serializable class with only transient fields | |
| JAVA0046 | 0.00 | JAVA0046 Name of class not derived from Exception ends with 'Exception' | |
| JAVA0047 | 0.00 | JAVA0047 Serializable class derives from invalid base class | |
| JAVA0048 | 0.00 | JAVA0048 Name of class derived from Exception does not end with 'Exception' | |
| JAVA0049 | 0.00 | JAVA0049 Nested block at depth N (maximum: M) | |
| JAVA0050 | 0.00 | JAVA0050 Class derives from java.lang.Error | |
| JAVA0051 | 0.00 | JAVA0051 Class derives from java.lang.RuntimeException | |
| JAVA0052 | 0.00 | JAVA0052 Class derives from java.lang.Throwable | |
| JAVA0053 | 0.00 | JAVA0053 Unused label | |
| JAVA0054 | 0.00 | JAVA0054 Inheritance depth N exceeds maximum M | |
| JAVA0055 | 0.00 | JAVA0055 Class should be interface | |
| JAVA0056 | 0.00 | JAVA0056 Unnecessary abstract modifier for interface or annotation | |
| JAVA0057 | 0.00 | JAVA0057 Unnecessary default constructor | |
| JAVA0058 | 0.00 | JAVA0058 Constructor calls super() | |
| JAVA0059 | 0.00 | JAVA0059 Method override only calls super() | |
| JAVA0061 | 0.00 | JAVA0061 Inaccessible member in anonymous class | |
| JAVA0062 | 0.00 | JAVA0062 Public class missing public member or protected constructor | |
| JAVA0063 | 0.00 | JAVA0063 Identifier name should not contain '$' | |
| JAVA0064 | 2.00 | JAVA0064 N variations of identifier name (maximum: M) | |
| JAVA0065 | 0.00 | JAVA0065 Unnecessary final modifier for method in final class | |
| JAVA0066 | 0.00 | JAVA0066 Unnecessary modifier for interface nested type | |
| JAVA0067 | 0.00 | JAVA0067 Array descriptor on identifier name | |
| JAVA0068 | 0.00 | JAVA0068 Modifiers not declared in recommended order | |
| JAVA0071 | 0.00 | JAVA0071 Strings compared with == | |
| JAVA0073 | 0.00 | JAVA0073 Integer division in floating-point context | |
| JAVA0074 | 0.00 | JAVA0074 Use of Object.notify() | |
| JAVA0075 | 0.00 | JAVA0075 Method parameter hides field | |
| JAVA0076 | 0.00 | JAVA0076 Use of magic number | |
| JAVA0077 | 0.00 | JAVA0077 Private field not used in declaring class | |
| JAVA0078 | 0.00 | JAVA0078 Floating point values compared with == | |
| JAVA0079 | 0.00 | JAVA0079 Use of instance to reference static member | |
| JAVA0080 | 0.00 | JAVA0080 Import declaration not used | |
| JAVA0081 | 0.00 | JAVA0081 Boolean literal in comparison | |
| JAVA0082 | 0.00 | JAVA0082 Unnecessary widening cast | |
| JAVA0083 | 0.00 | JAVA0083 Unnecessary instanceof test | |
| JAVA0084 | 0.00 | JAVA0084 Should use compound assignment operator | |
| JAVA0085 | 0.00 | JAVA0085 Use of sun.* class | |
| JAVA0087 | 0.00 | JAVA0087 Use of Thread.sleep() | |
| JAVA0089 | 0.00 | JAVA0089 Use of restricted package | |
| JAVA0092 | 0.00 | JAVA0092 Use of restricted type | |
| JAVA0093 | 0.00 | JAVA0093 Redundant assignment | |
| JAVA0094 | 0.00 | JAVA0094 Field hides a superclass field | |
| JAVA0095 | 0.00 | JAVA0095 Uninitialized private field | |
| JAVA0096 | 0.00 | JAVA0096 Field in nested class hides outer field | |
| JAVA0098 | 0.00 | JAVA0098 Minimize use of implicit field initializers | |
| JAVA0100 | 0.00 | JAVA0100 Class contains N non-final fields (maximum: M) | |
| JAVA0101 | 0.00 | JAVA0101 Unnecessary modifier for field in interface | |
| JAVA0102 | 0.00 | JAVA0102 Last statement in finalize() not super.finalize() | |
| JAVA0103 | 0.00 | JAVA0103 Explicit call to finalize() | |
| JAVA0104 | 0.00 | JAVA0104 finalize() only calls super.finalize() | |
| JAVA0105 | 0.00 | JAVA0105 Duplicate import declaration | |
| JAVA0106 | 0.00 | JAVA0106 Unnecessary import from current package | |
| JAVA0108 | 0.00 | JAVA0108 Incorrect javadoc: no @param tag for 'parameter' | |
| JAVA0109 | 0.00 | JAVA0109 Incorrect javadoc: no parameter 'parameter' | |
| JAVA0110 | 0.00 | JAVA0110 Incorrect javadoc: no @return tag | |
| JAVA0111 | 0.00 | JAVA0111 Incorrect javadoc: @return tag for void method | |
| JAVA0112 | 0.00 | JAVA0112 Incorrect javadoc: no exception 'exception' in throws | |
| JAVA0113 | 0.00 | JAVA0113 Incorrect javadoc: no @author tag | |
| JAVA0114 | 1.00 | JAVA0114 Incorrect javadoc: no @version tag | |
| JAVA0115 | 0.00 | JAVA0115 Incorrect javadoc: no @throws or @exception tag for 'exception' | |
| JAVA0116 | 0.00 | JAVA0116 Missing javadoc: field 'field' | |
| JAVA0117 | 0.00 | JAVA0117 Missing javadoc: method 'method' | |
| JAVA0118 | 0.00 | JAVA0118 Missing javadoc: type 'type' | |
| JAVA0119 | 0.00 | JAVA0119 Control variable changed within body of for loop | |
| JAVA0123 | 0.00 | JAVA0123 Use all three components of for loop | |
| JAVA0125 | 0.00 | JAVA0125 Continue statement with label | |
| JAVA0126 | 7.00 | JAVA0126 Method declares unchecked exception in throws | |
| JAVA0128 | 0.00 | JAVA0128 Public constructor in non-public class | |
| JAVA0130 | 0.00 | JAVA0130 Non-static method does not use instance fields | |
| JAVA0131 | 0.00 | JAVA0131 Compatible method does not override base | |
| JAVA0132 | 0.00 | JAVA0132 Method overload with compatible signature | |
| JAVA0133 | 0.00 | JAVA0133 Non-synchronized method overrides synchronized method | |
| JAVA0135 | 0.00 | JAVA0135 Only one of Object.equals and Object.hashCode defined: missing 'method' | |
| JAVA0136 | 0.00 | JAVA0136 N methods defined in class (maximum: M) | |
| JAVA0137 | 0.00 | JAVA0137 Non-abstract class missing constructor | |
| JAVA0138 | 0.00 | JAVA0138 N parameters defined for method (maximum: M) | |
| JAVA0139 | 0.00 | JAVA0139 Definition of main other than public static void main(java.lang.String[]) | |
| JAVA0141 | 0.00 | JAVA0141 Unnecessary modifier for method in interface | |
| JAVA0143 | 0.00 | JAVA0143 Synchronized method | |
| JAVA0144 | 0.00 | JAVA0144 Line exceeds maximum M characters | |
| JAVA0145 | 0.00 | JAVA0145 Tab character used in source file | |
| JAVA0150 | 0.00 | JAVA0150 java.lang.Error (or subclass) thrown | |
| JAVA0153 | 0.00 | JAVA0153 Inefficient conversion of integer to string | |
| JAVA0159 | 0.00 | JAVA0159 Inefficient conversion of string to integer | |
| JAVA0160 | 2.00 | JAVA0160 Method does not throw specified exception | |
| JAVA0161 | 0.00 | JAVA0161 Conditional wait() not in loop | |
| JAVA0163 | 0.00 | JAVA0163 Empty statement | |
| JAVA0165 | 0.00 | JAVA0165 Conflicting return statement in finally block | |
| JAVA0166 | 2.00 | JAVA0166 Generic exception caught | |
| JAVA0167 | 0.00 | JAVA0167 ThreadDeath not rethrown | |
| JAVA0169 | 0.00 | JAVA0169 Unnecessary catch block: exception 'exception' | |
| JAVA0170 | 0.00 | JAVA0170 Caught exception not derived from java.lang.Exception | |
| JAVA0171 | 0.00 | JAVA0171 Unused local variable | |
| JAVA0173 | 8.00 | JAVA0173 Unused method parameter | |
| JAVA0174 | 0.00 | JAVA0174 Assigned local variable never used | |
| JAVA0175 | 0.00 | JAVA0175 Successive assignment to variable | |
| JAVA0176 | 0.00 | JAVA0176 Local variable name does not have required form | |
| JAVA0177 | 0.00 | JAVA0177 Variable declaration missing initializer | |
| JAVA0179 | 0.00 | JAVA0179 Local variable hides visible field | |
| JAVA0233 | 0.00 | JAVA0233 Definition of serialVersionUID other than 'private static final long serialVersionUID' | |
| JAVA0234 | 0.00 | JAVA0234 Class is Serializable but does not define serialVersionUID | |
| JAVA0235 | 0.00 | JAVA0235 Class defines serialVersionUID but does not implement Serializable | |
| JAVA0236 | 0.00 | JAVA0236 Attempt to clone an object which does not implement Cloneable | |
| JAVA0237 | 0.00 | JAVA0237 Class implements Cloneable but does not have public clone method | |
| JAVA0238 | 0.00 | JAVA0238 Clone method does not call super.clone() | |
| JAVA0239 | 0.00 | JAVA0239 Class declares 'readObject' or 'writeObject' but does not implement Serializable | |
| JAVA0240 | 0.00 | JAVA0240 Serializable class which declares readObject or writeObject but not both | |
| JAVA0241 | 0.00 | JAVA0241 'readObject' or 'writeObject' should be declared private in Serializable class | |
| JAVA0242 | 0.00 | JAVA0242 Transient field in non-Serializable class | |
| JAVA0243 | 0.00 | JAVA0243 'readResolve' or 'writeReplace' should be declared private or protected | |
| JAVA0244 | 0.00 | JAVA0244 Field or method name in subclass differs only by case from inherited field or method | |
| JAVA0245 | 0.00 | JAVA0245 JUnit TestCase with non-trivial constructor | |
| JAVA0246 | 0.00 | JAVA0246 JUnit assertXXX statement missing message parameter | |
| JAVA0247 | 0.00 | JAVA0247 JUnit 'setUp()' and 'tearDown()' should call super method | |
| JAVA0248 | 0.00 | JAVA0248 JUnit method 'setUp' or 'tearDown' with incorrect signature | |
| JAVA0249 | 0.00 | JAVA0249 JUnit TestCase 'suite()' should be declared static | |
| JAVA0250 | 0.00 | JAVA0250 JUnit TestCase declares testXXX method with incorrect signature | |
| JAVA0251 | 0.00 | JAVA0251 Use '%n' for line breaks in printf/format for platform independence | |
| JAVA0252 | 0.00 | JAVA0252 'enum' is a Java 1.5 reserved word | |
| JAVA0253 | 0.00 | JAVA0253 Not all enum constants consumed in switch statement | |
| JAVA0254 | 0.00 | JAVA0254 Use enhanced for loop construct instead of Iterator | |
| JAVA0255 | 0.00 | JAVA0255 Result of method invocation not used | |
| JAVA0256 | 0.00 | JAVA0256 Assignment of external collection/array to field | |
| JAVA0257 | 0.00 | JAVA0257 Use of 'Constant Interface' anti-pattern | |
| JAVA0258 | 0.00 | JAVA0258 Implement Iterable for foreach compatibility | |
| JAVA0259 | 0.00 | JAVA0259 Return of collection/array field | |
| JAVA0260 | 0.00 | JAVA0260 Use 'enum' instead of Enumerated Type pattern | |
| JAVA0261 | 0.00 | JAVA0261 Use specialized Enum collection types | |
| JAVA0262 | 0.00 | JAVA0262 Use of char in integer context | |
| JAVA0263 | 0.00 | JAVA0263 Long literal ends with 'l' instead of 'L' | |
| JAVA0264 | 0.00 | JAVA0264 Integer math in long context - check for overflow | |
| JAVA0265 | 0.00 | JAVA0265 Use of Throwable.printStackTrace() | |
| JAVA0266 | 0.00 | JAVA0266 Use of System.out | |
| JAVA0267 | 0.00 | JAVA0267 Use of System.err | |
| JAVA0269 | 0.00 | JAVA0269 Contents of StringBuffer never used | |
| JAVA0270 | 0.00 | JAVA0270 Use Java 5.0 enhanced for loop construct to iterate over all elements in an array | |
| JAVA0271 | 0.00 | JAVA0271 Minimize use of on-demand (.*) static imports | |
| JAVA0272 | 0.00 | JAVA0272 Thread.run() called | |
| JAVA0273 | 0.00 | JAVA0273 Non-final derivative of Thread calls start() in constructor | |
| JAVA0274 | 0.00 | JAVA0274 Serializable class has a synchronized readObject() | |
| JAVA0275 | 0.00 | JAVA0275 Serializable class has a synchronized writeObject() and no other synchronized methods | |
| JAVA0276 | 0.00 | JAVA0276 Unnecessary use of String constructor | |
| JAVA0277 | 0.00 | JAVA0277 Iterator.next() implementation does not throw NoSuchElementException | |
| JAVA0278 | 0.00 | JAVA0278 Unnecessary use of Boolean constructor | |
| JAVA0279 | 0.00 | JAVA0279 Serialization method readObject or readObjectNoData calls an overridable method | |
| JAVA0280 | 0.00 | JAVA0280 IllegalMonitorStateException caught | |
| JAVA0281 | 0.00 | JAVA0281 Iterator.next() not called in loop | |
| JAVA0282 | 0.00 | JAVA0282 Call to Iterator.next() in loop which does not test Iterator.hasNext() | |
| JAVA0283 | 0.00 | JAVA0283 Control variable not updated in loop body | |
| JAVA0284 | 0.00 | JAVA0284 Explicit garbage collection | |
| JAVA0285 | 0.00 | JAVA0285 Dereference of potentially null variable | |
| JAVA0286 | 0.00 | JAVA0286 Dereference of null variable | |
| JAVA0287 | 0.00 | JAVA0287 Unnecessary null check | |
| JAVA0288 | 0.00 | JAVA0288 Inconsistent null check | |
| LINES | 707.00 | Number of lines in the source file | |
| LINE_COMMENT | 11.00 | Number of line comments | |
| LOC | 249.00 | Lines of code | |
| LOGICAL_LINES | 103.00 | Number of statements | |
| LOOPS | 0.00 | Number of loops | |
| NEST_DEPTH | 5.00 | Maximum nesting depth | |
| OPERANDS | 529.00 | Number of operands | |
| OPERATORS | 818.00 | Number of operators | |
| PARAMS | 30.00 | Number of formal parameter declarations | |
| PROGRAM_LENGTH | 1347.00 | Halstead program length | |
| PROGRAM_VOCAB | 231.00 | Halstead program vocabulary | |
| PROGRAM_VOLUME | 0.00 | Halstead program volume | |
| RETURNS | 38.00 | Number of return points from functions | |
| SIZE | 25296.00 | Size of the file in bytes | |
| UNIQUE_OPERANDS | 187.00 | Number of unique operands | |
| UNIQUE_OPERATORS | 44.00 | Number of unique operators | |
| WHITESPACE | 63.00 | Number of whitespace lines | |